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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60c216b97bf8906e832526a882df90588a08c3a8f8d5fa0a4f79edf563bdd53f' 
  AND token = '0anYSCuz/MUzYn2ZSp6HZe5ayR/BU08WsrIPOHZ6cGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}